package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.*;
import org.apache.kafka.common.TopicPartition;

import java.time.Duration;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.Properties;

public class ConsumerQuickStart {
    public static void main(String[] args) {
        //2.编写配置信息
        Properties properties = new Properties();
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.200.130:9092");
        //跟生产者不同,消费者需要声明组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group2");
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.ENABLE_AUTO_COMMIT_CONFIG, false);//改为手动提交
        //1.编写消费者
        KafkaConsumer<String, String> consumer = new KafkaConsumer<String, String>(properties);
        //设置当前监听的topic
        consumer.subscribe(Collections.singletonList("itcast-topic-out"));
        //拉取消息
        while (true) {
            ConsumerRecords<String, String> records = consumer.poll(Duration.ofMillis(1000));//每隔一秒进行拉取消息
        /*    for (ConsumerRecord<String, String> record : records) {
                System.out.println(record.key()+":"+record.value());
                try {
                    consumer.commitSync();
                } catch (Exception e) {
                    System.out.println("记录提交失败的异常："+e);
                }

            }*/   //同步提交
            /*for (ConsumerRecord<String, String> record : records) {
                System.out.println(record.key()+":"+record.value());
                    consumer.commitAsync(new OffsetCommitCallback() {
                        @Override
                        public void onComplete(Map<TopicPartition, OffsetAndMetadata> map, Exception e) {
                            if (null!=e){
                                System.out.println("记录错误的提交偏移量："+ map+",异常信息"+e);
                            }
                        }
                    });*/  //异步提交

   /*         //一般我们都是同步加异步

            try {
                for (ConsumerRecord<String, String> record : records) {
                    System.out.println(record.key()+":"+record.value());
                    consumer.commitAsync();
                }
            } catch (Exception e) {
                e.printStackTrace();
                System.out.println("记录错误信息："+e);
            } finally {
                try {
                    consumer.commitSync();
                }finally {
                    consumer.close();
                }
            }
        }*/
            for (ConsumerRecord<String, String> record : records) {
                System.out.println(record.key() + ":" + record.value());
            }
        }
    }
}